I left 2 months ago, to move to Somerset. Have lived in Newton Heath all my life.
It is full of drugs and crime in Newton Heath. Had a mosque burnt down and a woman beaten to death with a candle stick at either end of my street. The place stinks of weed. There are stabbings, shootings, hit and runs all the time. This is a place where kids chuck bricks at cars for entertainment.
NH will always be home, but moving to Somerset is the best decision I have made, from a lifestyle perspective.
I still visit Newton Heath regularly, as my old man is still there (Albert Gardens, off Averill St) And I drive through to the stadium after picking my cousin up in Failsworth.
It's horrid to see what has become of the area, yes it always had an 'edge' in certain parts like Briscoe Lane, Scotland Hall Rd etc. But it seems the majority is now really dodgy, with all the problems you describe above. Old Church St has lost most of it's old shops, to be replaced by takeaways, vaping shops, and the now widespread ''Turkish'' barbers.
Of course, that isn't unique ... most towns have gone the same way.
Brookdale Park is unloved and overgrown. Nothing like the lovely park we practically lived in as kids.
Only the Windsor Rd area still looks cared for and as was. Even my dad's little cul de sac, which was well known for being so well kept has suffered. Many gardens left to grow wild. Weeds line the pavements, which are always blocked by cars parked. My aunt also lived there until she passed away a couple of years ago. Her house, which had amazing gardens front and back, was bought by an investment company and rented out. The front garden now has it's double gates to the drive chained and locked, various bins are lined up against it, and their car is left parked on the pavement outside (totally blocking it) as the drive itself is home to a huge trampoline .... my aunt would be spinning. Again, this isn't unique, it's just the general attitude of many now .... no care, no pride.
I cannot wait to 'escape' as you have next year!